John 15:26:
But when the Counselor comes, whom I shall send to you from the Father, even the Spirit of truth, who proceeds from the Father, he will bear witness to me."
John 16:7:
Nevertheless I tell you the truth: it is to your advantage that I go away, for if I do not go away, the Counselor will not come to you; but if I go, I will send him to you.
John 20:22:
And when he had said this, he breathed on them, and said to them, "Receive the Holy Spirit."
John 16:15:
All things whatsoever the Father hath are mine. Therefore I said that he shall receive of me and show it to you.
You should read the scripture: "whom I shall send to you FROM THE FATHER, even the Spirit of Truth, who proceeds FROM THE FATHER, he shall bear witness to me"
And then there is that other small matter of the anethemas placed on anyone who adds or takes away from the Creed, placed by the Ecumenical Councils.......Even a joint Orthodox-Catholic Committee has ruled that the filioque should not be in the creed. When the Ecumenical Patriarch & Pope John Paul II celebrated Mass, the Filioque was not used. Read the Creed on the doors of St. Peter's Basilica, NO filioque there either.